G6 vs newest sensors: Real difference in high ISO noize

Started Mar 5, 2014 | Questions thread
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Øyvin Eikeland
Regular MemberPosts: 127Gear list
Re: G6 vs newest sensors: Real difference in high ISO noize
In reply to texinwien, Mar 5, 2014

texinwien wrote:

The formula for determining the exact ISO value at any pixel on the x-axis is 50 * 2^(n/60), where 'n' is the number of pixels from x=50 ISO (the far left of the graph). The center of the furthest right E-M5 dot is 473 pixels to the right of x=50 ISO. Plugging that into our formula, we have:

50 * 2^(473/60) = 11,806 ISO

If anything, the graph is unfair to the E-M5 by 42 ISO steps


Øyvin Eikeland


I am not too concerned about the graphical presentation of the data. If you hover your mouse over the samples the actual measurements are shown. For example:


Measured ISO: 12663

Manufacturer ISO: 12800

Dynamic range: 5.59Ev

OM-D E-M5:

Measured ISO: 5953

Manufacturer ISO: 12800

Dynamic range: 7.5Ev

I have learned(from this forum) that when both cameras are set at ISO12800 the resulting shutter speed and aperture can be the same for both cameras. The difference in measured iso comes from the fact that olympus deliberately under-exposes the sensor and apply gain digitally in post processing. If I (for some reason) need to shoot at ISO12800 I should compare the two measurement points listed above. It would not be correct to compare them directly I think. That would imply a 2-stop advantage to the OM-D E-M5. How do I calculate the correct dynamic range when both cameras are set at ISO 12800?



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